Practical No. : 8 - Create a binary file with roll_no, name and marks of some students and update the marks of specific student.

 

'''Practical No: 9: WAP in Python to create a binary file with roll_no, name and

marks of the students and update the marks of specific student.'''

import pickle

S={}

f=open('stud.dat','wb')

c='y'

while c=='y' or c=='Y':

    rno=int(input("Enter the roll no. of the student : "))

    name=input("Enter the name of the student: ")

    marks=int(input("Enter the marks of the student: "))

    S['RollNo']=rno

    S['Name']=name

    S['Marks']=marks

    pickle.dump(S,f)

    c=input("Do You Want to add more students(y/n): ")

f.close()

f=open('stud.dat','rb+')

rno=int(input("Enter the roll no. of the student to be updated: "))

marks=int(input("Enter the updated marks of the student: "))

f.seek(0,0)

m=0

try:

    while True:

        pos=f.tell()

        S=pickle.load(f)

        if S["RollNo"] == rno:

            f.seek(pos)

            S["Marks"]=marks

            pickle.dump(S,f)

            m=m+1

except EOFError:

    f.close()

if m==0:

        print("Student not Found")

else:      

    f=open('stud.dat','rb')

    try:

        while True:

            S=pickle.load(f)

            print(S)

    except EOFError:

        f.close()